Isle Royale Rainfall Forecast

Today 16 Aug
85%
Mon 17 Aug
No Rain
Tue 18 Aug
40%
Wed 19 Aug
No Rain
Thu 20 Aug
5%
Fri 21 Aug
35%
Sat 22 Aug
20%

Isle Royale Rainfall Statistics

August Rainfall

Copper Harbor (58.4 miles)

Total Rainfall 2026
15.2in
Daily Average 2026
0.1in
Wettest Day 18 February, 2026
1.1in
Wet Days 2026
95/228 (42%)
Total Rainfall July
1.6in
Daily Average July
0.1in
Wettest Day 17 July, 2026
1in
Wet Days July
9/31 (29%)
Total Rainfall August
0.7in
Daily Average August
0.05in
Wettest Day 7 August, 2026
0.4in
Wet Days August
2/16 (13%)

Climate (2021–2025)

Copper Harbor (58.4 miles)

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Annual Average 2021–2025
27.2in
Monthly Average 2021–2026
2.2in
Daily Average 2021–2026
0.1in
Wettest Day 10 November, 2022
1.8in

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